The SRT --> Tesla connection
Chrysler doesn't meet federal Corporate Average Fuel Economy standards, disproportionately because of the SRT line, so it has to buy environmental "credits" from other companies. Chrysler is the largest purchaser of credits from Tesla. It's an important source of revenue for Tesla.
So I guess you could say that sales of SRTs help keep Tesla alive and sales of Teslas allow more SRTs to be sold.